叶片前缘双出口孔射流冷却效率数值模拟

利用数值模拟的方法研究了叶片前缘双出口孔射流冷却效率.该孔型是一种新概念气膜孔.吹风比变化范围为1.0～3.5,主流通道入口湍流度30%.结果表明,圆柱孔射流冷却效率和实验数据吻合较好,随着吹风比增加,单孔射流冷却效率减小.双出口孔有效地改善了叶片前缘冷却效率.吹风比从1.0增加到2.5时,冷却效率显著增加,吹风比为2.5和3.0时的冷却效率没有显著差别,吹风比为3.5时的冷却效率较低.双出口孔射流冷却效率径向分布比较均匀. 

Numerical simulation of film cooling effectiveness with one inlet and double outlet hole on leading edge

Film cooling effectiveness with one inlet and double outlet hole injection on leading edge was studied by numerical simulation. This hole is novel concept geometry. Blowing ratios varied from 1.0 to 3.5. Turbulence intensity at inlet of tunnel is 30%. The result shows that the distribution of cooling effectiveness with cylindrical hole injection agrees with the experimental data and cooling effectiveness decreases when increasing blowing ratios. Film cooling effectiveness is improved by one inlet and double outlet hole injection. Cooling effectiveness increases when increasing blowing ratios from 1.0 to 2.5, but a weak dependence of cooling effectiveness on blowing ratios is found between blowing ratios of 2.5 and 3.0 and cooling effectiveness is small at blowing ratio of 3.5. Spanwise distribution of cooling effectiveness is uniform.